RAM Compatibility: Substituting PC-133 for PC-100
PC-133 and PC-100 RAM modules are backwards compatible. Higher speed
memory modules always default to the highest CAS latency rating at
slower speeds. For example, a PC-133 CL3 (3-2-2) chip will run at
either PC-100 or PC-66, CL2 (2-2-2). If you purchase ...
RAM: PC-133 RAM (CL2 vs. CL3)
Legacy SDRAM modules for older Macs utilize a small programming chip
called the Serial Presence Detect (SPD). This chip tells the computer
what it is, and how it should be used. It has Primary, Secondary, and
Tertiary programming for CLx settings. In most...
RAM: Installation Videos
If you need assistance installing your memory (RAM) upgrade kit, OWC
offers detailed installation videos for a wide variety of Mac models.
Please use the link below to find your specific Mac video.
RAM: Intel Macs - Pairing RAM Modules
Generally, any iMac, non-Retina MacBook, or non-Retina MacBook Pro, or
Mac Mini from the last several years should allow RAM modules of the
same spec but different capacities to be installed in any of the
RAM slots in the computer. There is no specific or...
RAM: Diagnostic Software Tests
Generally the best software-based RAM test you can use for your Mac is
the one built into Apple's AHT (Apple Hardware Test) suite. To learn
more about the AHT, go to https://support.apple.com/en-us/HT201257
RAM: How Much Do I Need?
Unfortunately, there is no one correct answer to this question.
It depends on the specific Mac you're using, the operating system on
that Mac, and the specific software applications you use. While
Apple lists only 2GB as the requirement for some operati...
RAM: ECC Errors
ECC (stands for Error Correcting Code) RAM modules are a special type
of module used in servers and workstations, typically in scenarios
where there is zero tolerance for data errors. Two common examples
include scientific computing and financial systems....
RAM: Mac Pro - Blinking White LED
This article applies to the following products:
OWC8566D3MPE4GB, OWC8566D3MPE8GB, OWC8566D3MPE16G
If your 2009 or 2010 Mac Pro is displaying a blinking white LED, you
may have mismatched RAM modules installed. The 4GB, 8GB, and 16GB
modules listed above...
RAM: Compatibility - 32GB Modules for MacPro6,1
Due to processor design and memory architecture, 32GB RAM module
utilization occurs at a bus speed of 1066MHz with Apple Mac Pro 2013
E5-16XXv2 4-Core, 6-Core, and 8-Core processor equipped models,
while factory 12-Core or after-market E5-26XX equipped mo...
RAM: Troubleshooting Tips
The Mac will not start up / it exhibits a beeping sound after startup
with new memory (or RAM) modules installed.
If you're having trouble getting your Mac to run normally after
installing new RAM, there are several things you can do ...
Mac: 2019 Mac Pro: Â Memory Configurations
Relevant Module Types / Base Modules:
* 'R DIMMS'
* 'LR DIMMS'
RAM (OWC2666DDR4Sxxx): Pairing Modules for 2020 iMacs
Recently we determined that OWC RAM modules that are compatible with
the August 2020 iMac (iMac20,1 and iMac 20,2), will report and operate
at a lower speed (2133 MHz instead of 2666 MHz) when paired with
modules from other manufacturers, including Apple ...